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在酵母表达的哺乳动物GAP的遗传分析
R Ballester1, T Michaeli, K Ferguson
1Cold Spring Harbor Laboratory, New York 11724.
Cell
|November 17, 1989
概括
哺乳动物GTPase激活蛋白 (GAP) 在酵母中通过抑制人类H-rasgly12和补充IRA1突变而起作用. 这表明GAP在调节RAS活动时与酵母IRA1共享生化功能.
科学领域:
- 分子生物学分子生物学
- 酵母遗传学 酵母遗传学
- 信号转导 信号转导
背景情况:
- 在酵母和哺乳动物中,RAS通路对于细胞信号传递至关重要.
- IRA1是一种酵母基因,编码GTPase激活蛋白 (GAP),该蛋白调节RAS活性.
- 了解跨物种蛋白质功能可以阐明保存的生物机制.
研究的目的:
- 为了研究在酵母 (Saccharomyces cerevisiae) 中哺乳动物GAP蛋白的功能表达.
- 为了确定哺乳动物GAP是否可以与酵母RAS信号交互和调节.
- 为了比较哺乳动物GAP与酵母IRA1蛋白的功能.
主要方法:
- 为哺乳动物GAP设计了一个酵母表达载体.
- 评估了GAP对酵母中的人类H-rasgly12和H-rasval12蛋白的影响.
- 测试了GAP对Ira1-突变酵母菌株的补充能力.
主要成果:
- 哺乳动物GAP在S. cerevisiae中得到了成功的表达.
- 表达的GAP抑制了人类的H-rasgly12,但不是H-rasval12.
- 在酵母突变中,GAP表达补充了IRA1功能的丧失.
结论:
- 哺乳动物GAP可以在酵母RAS通路中发挥作用.
- GAP与酵母IRA1具有功能上的相似之处,特别是在调节RAS方面.
- 这表明GAP家族蛋白质在控制RAS调节的GTP水解中起着保留作用.
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